(1) The mixed and simple water solution on the concentration of 1000 p.p.m. were prepared from the each catalytic trace element and a ferrous iron compound.
The author studied on the change of catalytic action by use of a curve figure on duration of 150 minutes, every 30 minute by the phthaline-method, and compared the each difference of catalytic value of mixed solution with simple solution.
(2) The author recognized, that on concerning with influence of the each catalytic substance in the ferrous iron solution, it is obtained generally the two-types with some exceptions between increase and decrease by electric potential difference.
It can not be decided by only electric potential difference because it is controlled by peculiarity of the each element.
(4) As a rule, the mixed solution is more instable than simple solution of the each trace element and its catalitic action decreased rapidly.
(5) From the above results, the author recognized undoubtedly that the catalytic power of the each trace element in the water solution of ferrous iron is influenced by electric potential difference of every trace element.
